PM notifications in Yahoo webmail get incorrectly displayed as quoted replies

Hi there, first of all this is not a Discourse bug, and it’s just another example of the incompetency of Yahoo email. But unfortunately there are still millions of active Yahoo email users and thousands of them are registered on my forum.

An issue was discovered with the display of notification emails for follow-up replies in the same PM thread. The initial notification email displays correctly in Yahoo webmail, but in subsequent ones only the unique text gets displayed, and the rest of the message including the “Visit message” link is hidden behind a “Show original message” link.

Again, I understand that this isn’t a Discourse issue per se, but maybe something could be changed in the headers and/or body of the emails that Discourse sends?